JP6160695B2 - COMMUNICATION METHOD, COMMUNICATION SYSTEM, CONTROL DEVICE, AND RADIO DEVICE - Google Patents

Description

  The present invention relates to a communication method, a communication system, a control device, and a wireless device.

  In recent years, wireless communication traffic has increased. In connection with this, utilization of empty channels (white space), such as a television broadcast frequency band, is examined (for example, refer to the following nonpatent literature 1).

J. et al. Wang, S.W. Filin, H .; Harada, “IEEE802.19-11 / 0067r0”, NICT, July 2011

  However, in the related art, when a plurality of wireless devices use the same frequency in the same area, there is a problem that interference control becomes difficult and interference increases if the communication methods of the plurality of wireless devices are different. .

  An object of the present invention is to provide a communication method, a communication system, a control device, and a wireless device capable of reducing interference in order to solve the above-described problems caused by the prior art.

  In order to solve the above-described problems and achieve the object, according to one aspect of the present invention, a wireless device transmits information indicating a wireless method that the wireless device can use for wireless communication or wireless broadcasting to a control device. The control device extracts a frequency corresponding to a wireless method indicated by information transmitted by the wireless device from frequency information associating a wireless method with a usable frequency, and the information indicating the extracted frequency is Proposed is a communication method, a communication system, a control device, and a wireless device, characterized in that the wireless device transmits to a wireless device, and the wireless device performs wireless communication or wireless broadcasting at a frequency indicated by information transmitted by the control device. The

  According to one aspect of the present invention, there is an effect that interference can be reduced.

FIG. 1 is an explanatory diagram illustrating an example of a functional configuration of a frequency management system. FIG. 2 is an explanatory diagram showing a system configuration example of the frequency management system. FIG. 3 is a diagram illustrating an example of a hardware configuration of the wireless device. FIG. 4 is a diagram illustrating an example of a hardware configuration of the frequency management device and the communication device. FIG. 5 is an explanatory diagram illustrating an example of a detailed configuration of the functional configuration of the frequency management device. FIG. 6 is an explanatory diagram illustrating an example of pixels in each area. FIG. 7 is an explanatory diagram showing an example of an available database for each pixel. FIG. 8 is an explanatory diagram showing an example of the usage rule table. FIG. 9 is an explanatory diagram illustrating an example of a usage status database. FIG. 10 is an explanatory diagram showing an example of the occupation degree table. FIG. 11 is an explanatory diagram showing an example of a sequence related to a frequency use request when there is one radio system in the frequency management system. FIG. 12 is an explanatory diagram showing an example of a sequence related to a frequency use request when there are two radio systems in the frequency management system. FIG. 13 is a flowchart illustrating an example of a process for unifying the wireless system performed by the frequency management apparatus. FIG. 14 is an explanatory diagram showing an example of a timing chart (No. 1) when periodically determining the degree of congestion for the frequencies f1, f2, and f3. FIG. 15 is an explanatory diagram showing an example of the occupation degree table at the timing t1. FIG. 16 is an explanatory diagram showing an example of the occupation degree table at the timing t2. FIG. 17 is an explanatory diagram illustrating an example of the occupation degree table at the timing t3. FIG. 18 is a flowchart illustrating an example of a process for canceling the unification of the wireless system performed by the frequency management apparatus. FIG. 19 is an explanatory diagram of an example (part 2) of a timing chart for periodically determining the degree of congestion for the frequencies f1, f2, and f3. FIG. 20 is an explanatory diagram showing an example of the occupation degree table at the timing t10. FIG. 21 is an explanatory diagram showing an example of a sequence when the wireless method is changed. FIG. 22 is an explanatory diagram showing a modified example of a sequence related to a frequency use request when there is one radio system in the frequency management system. FIG. 23 is an explanatory diagram showing a modified example of a sequence related to a frequency use request when there are two radio systems in the frequency management system. FIG. 24 is an explanatory diagram illustrating an example of throughput characteristics of the radio system x.

  Exemplary embodiments of a communication method, a communication system, a control device, and a wireless device according to the present invention will be described below in detail with reference to the drawings. The communication system of the present invention is realized by the following frequency management system, for example. Moreover, the control apparatus of this invention is implement | achieved by the following frequency management apparatuses, for example.

(Example of functional configuration of frequency management system)
FIG. 1 is an explanatory diagram illustrating an example of a functional configuration of a frequency management system. As shown in FIG. 1, the frequency management system 100 includes a plurality of wireless devices 101 and a frequency management device 110. The plurality of wireless devices 101 are each connected to the communication device 102 by a predetermined wireless method. The frequency management device 110 is communicatively connected to the wireless device 101, and manages the frequency for connection between the wireless device 101 and the communication device 102 by each wireless method.

  Here, in IEEE802, three wireless systems, IEEE802.11af, IEEE802.15.4m, and IEEE802.22, are standardized for a wireless system that performs secondary use of TVWS (TV white space). If IEEE802.11af is used, for example, Wi-Fi (Wireless Fidelity) ("Wi-Fi" is a registered trademark) can be used in TVWS. If IEEE802.15.4m is used, for example, ZigBee ("ZigBee" is a registered trademark) of the short-range wireless communication standard can be used in TVWS. If IEEE 802.22 is used, a wide area wireless network that covers a medium and long distance area can be constructed.

  In IEEE802.19.1, coexistence of wireless devices 101 using different wireless systems is being studied. In IEEE802.19.1, a coexistence manager that manages coexistence of the wireless device 101 that performs secondary use of TVWS is provided, and two types of coexistence services, a management service and an information service, are provided for the wireless system. Which service is used can be determined for each wireless device 101 or for each region.

  In the management service, coexistence managers realize coexistence of different wireless systems by directly assigning frequencies of individual wireless devices 101. On the other hand, in the information service, in response to a request from the wireless device 101, information on a frequency used by the wireless device 101 adjacent to the wireless device 101 is provided, and the corresponding wireless system makes it easy to select a frequency with less interference.

  In performing such a management service, it is necessary to determine coexistence conditions between wireless apparatuses 101 using different wireless systems or the same wireless system. For example, the communication area is not covered when using different wireless systems, and the sum of channel occupancy rates does not exceed 100% when the same wireless system is used. A frequency is assigned to the wireless device 101 at a position where a frequency satisfying such a condition exists.

  Conventionally, since the information on the area or occupancy rate necessary for frequency allocation is performed based on prediction, each wireless device 101 requests a wide frequency band or a wide area to ensure its own communication quality. Become. Therefore, the frequency band of the wireless device 101 that can be accepted decreases, and the frequency utilization efficiency decreases.

  Therefore, in the present embodiment, the frequency that can be used is set according to the combination of the position of the wireless device 101 and the wireless method, thereby reducing the occurrence of each communication that is difficult to perform interference control of the same frequency and different wireless methods. And reduce interference.

  The wireless device 101 includes a transmission unit 121, a reception unit 122, and a wireless unit 123. The frequency management device 110 includes a reception unit 111, an extraction unit 112, a transmission unit 113, an acquisition unit 114, and an update unit 115. The transmission unit 121 transmits information indicating a wireless method that the wireless device 101 can use for wireless communication or wireless broadcasting to the frequency management device 110. The transmission unit 121 transmits the position information of the wireless device 101 together with information indicating a wireless method that the wireless device 101 can use for wireless communication or wireless broadcasting.

  The receiving unit 111 receives information indicating a wireless method that the wireless device 101 can use for wireless communication or wireless broadcasting from the wireless device 101. The extraction unit 112 extracts the frequency corresponding to the wireless method indicated by the information transmitted by the wireless device 101 from the frequency information associating the wireless method with the usable frequency. For example, the extraction unit 112 uses the position information of the wireless device 101 to extract a frequency in the area where the wireless device 101 is located.

  The transmission unit 113 transmits information indicating the frequency extracted by the extraction unit 112 to the wireless device 101. The receiving unit 122 of the wireless device 101 receives information transmitted from the frequency management device 110. The wireless unit 123 performs wireless communication or wireless broadcasting with the communication apparatus 102 using the frequency indicated by the information received by the receiving unit 122.

  The acquisition unit 114 acquires information indicating the radio wave interference degree for each frequency in the wireless device group including the wireless device 101. For example, when the number of radio waves increases and the radio wave congestion level increases, the degree of interference increases in proportion thereto. Based on the information acquired by the acquisition unit 114, the update unit 115 updates the frequency information so as to reduce the radio scheme corresponding to the frequency at which the degree of interference exceeds a predetermined level. That the degree of interference exceeds a predetermined degree means that, for example, the degree of radio wave congestion becomes a predetermined amount or more.

  The extraction unit 112 extracts the frequency corresponding to the wireless method indicated by the information transmitted by the wireless device 101 from the frequency information updated by the update unit 115. The transmission unit 113 transmits information indicating the frequency extracted by the acquisition unit 114 to the wireless device 101.

  In addition, the update unit 115 determines the above-described reduced radio scheme when the interference level of the frequency at which the interference level exceeds the predetermined level is lower than the predetermined level based on the information indicating the interference level acquired by the acquiring unit 114. The frequency information is updated so that is restored. That the degree of interference falls below a predetermined degree means that, for example, the number of radio waves decreases and the radio wave congestion level decreases. The extraction unit 112 extracts the frequency corresponding to the wireless method indicated by the information transmitted by the wireless device 101 from the frequency information updated by the update unit 115. The transmission unit 113 transmits information indicating the frequency extracted by the extraction unit 112 to the wireless device 101.

  The updating unit 115 disables the wireless method selected based on the number of wireless terminals that are using the wireless method in the wireless device group from the wireless methods corresponding to frequencies whose interference degree exceeds a predetermined degree. The frequency information is updated as follows. That is, at least one or more wireless systems that are in use are disabled at a frequency at which the degree of radio wave congestion is a predetermined amount or more. The wireless system to be disabled is, for example, a wireless system with a small number of uses. The wireless device 101 of the wireless method that has become unusable can be used in the same wireless method by changing to another frequency.

  When there is no radio system whose predetermined ratio exceeds a threshold among radio systems corresponding to frequencies whose degree of interference exceeds a predetermined degree, the update unit 115 is a radio system corresponding to a frequency whose degree of interference exceeds a predetermined degree. Does not decrease. The predetermined ratio is a ratio of the number of wireless terminals using the wireless system to the number of wireless device groups, and is called an occupation ratio. Even in a frequency where the degree of radio wave congestion is equal to or greater than a predetermined amount, if there is no radio system whose occupation ratio exceeds the threshold, the radio system is not reduced. Thereby, it is not necessary to change many radio | wireless apparatuses 101 to another frequency.

  The updating unit 115 updates the frequency information so as to enable only one wireless method among wireless methods corresponding to frequencies whose interference degree exceeds a predetermined degree. The threshold value may be a predetermined fixed value, but is a threshold value according to the number of frequencies in which only the wireless method can be used in the frequency information. The threshold value according to the number of frequencies for which only the radio system can be used in the frequency information is, for example, an expected frequency ratio in the radio system. Details of the expected ratio will be described later.

  The transmission unit 113 transmits information indicating the frequency extracted by the extraction unit 112 and information indicating a period in which the extracted frequency is usable to the wireless device 101. The receiving unit 122 of the wireless device 101 receives information indicating a frequency and information indicating a period in which the frequency can be used from the wireless device 101. The wireless unit 123 performs wireless communication or wireless broadcasting at the frequency indicated by the information transmitted by the frequency management device 110 until the effective period indicated by the information received by the receiving unit 122 elapses.

(System configuration example of frequency management system)
FIG. 2 is an explanatory diagram showing a system configuration example of the frequency management system. As illustrated in FIG. 2, the frequency management system 100 includes a plurality of wireless devices 101, a plurality of communication devices 102, and a frequency management device 110. Note that the wireless device 101 includes wireless devices 101a, 101b, 101c, and 101d as shown in FIG. As shown in FIG. 2, the communication device 102 includes communication devices 102a, 102b, 102c, and 102d.

  The plurality of wireless devices 101 relay the communication device 102 and the network 220, respectively. The communication device 102 is, for example, a smartphone, a mobile phone, a PC (Personal Computer), or the like. The wireless device 101 and the communication device 102 are connected via a wireless communication network 201, respectively. As shown in FIG. 2, the wireless communication network 201 includes wireless communication networks 201a, 201b, 201c, and 201d. The frequency management device 110 manages frequencies that can be used in the wireless communication network 201.

  The wireless device 101 connects to the communication device 102 using a predetermined range in which communication by the wireless communication network 201 is possible as a communication area. The wireless device 101 and the communication device 102 are connected by the wireless communication network 201 when they are in a positional relationship where communication is possible.

  For example, as a wireless method of the wireless communication network 201, a wireless LAN (Local Area Network), IEEE802.11a, IEEE802.11n, W-CDMA (Wideband Code Multiple Access), LTE (Long Term Registration), Etc.

  Further, the network is not limited to the wireless communication network 201 and may be a broadcast network. In that case, the wireless device 101 may be a transmitting device and the communication device 102 may be a receiving device. Examples of the wireless system include ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) (registered trademark).

  The wireless device 101 transmits information regarding its own wireless system and its own location information to the frequency management device 110 together with the frequency use request. The frequency management device 110 manages which frequency of which radio system can be used, and extracts frequencies that can use the radio system of the radio device 101. The frequency management device 110 returns the extracted frequency to the wireless device 101 as an available frequency. The wireless device 101 performs communication and broadcasting using the frequency specified by the frequency management device 110.

(Example of hardware configuration of wireless device)
FIG. 3 is a diagram illustrating an example of a hardware configuration of the wireless device. As illustrated in FIG. 3, the wireless device 101 includes a CPU 301, a memory 302, a user interface 303, a communication interface 304, and a position information acquisition device 305. The CPU 301, the memory 302, the user interface 303, the communication interface 304, and the position information acquisition device 305 are connected by a bus 309.

  A CPU 301 (Central Processing Unit) governs overall control of the wireless device 101. The memory 302 includes, for example, a main memory and an auxiliary memory. The main memory is, for example, a RAM (Random Access Memory). The main memory is used as a work area for the CPU 301.

  The auxiliary memory is, for example, a nonvolatile memory such as a magnetic disk, an optical disk, or a flash memory. Various programs for operating the wireless device 101 are stored in the auxiliary memory. The program stored in the auxiliary memory is loaded into the main memory and executed by the CPU 301.

  The user interface 303 includes, for example, an input device that receives an operation input from the user, an output device that outputs information to the user, and the like. The input device can be realized by, for example, a touch panel, a key (for example, a keyboard), a remote controller, or the like. The output device can be realized by, for example, a touch panel, a display, a speaker, or the like. The user interface 303 is controlled by the CPU 301.

  The communication interface 304 is an interface that performs communication with an external device of the frequency management device 110 by, for example, wireless or wired. The communication interface 304 is controlled by the CPU 301. The location information acquisition device 305 acquires location information of the wireless device 101. An example of the position information acquisition apparatus 305 is an apparatus that acquires position information based on GPS information from a GPS (Global Positioning System) satellite. Note that the location information acquisition device 305 is not limited to a device that acquires location information based on GPS information, and when the wireless device 101 is fixedly installed, the location information for fixed installation is stored in the memory 302 in advance. Alternatively, a device that acquires from the memory 302 may be used.

  The transmission unit 121, the reception unit 122, and the wireless unit 123 of the wireless device 101 described with reference to FIG. That is, the function of each unit is realized by the CPU 301 executing various programs.

(Example of hardware configuration of frequency management device and communication device)
FIG. 4 is a diagram illustrating an example of a hardware configuration of the frequency management device and the communication device. In the description of FIG. 4, the subject is described as the frequency management device 110, but the communication device 102 has the same configuration. As illustrated in FIG. 4, the frequency management device 110 includes a CPU 401, a memory 402, a user interface 403, and a communication interface 404. The CPU 401, the memory 402, the user interface 403, and the communication interface 404 are connected by a bus 409.

  The CPU 401 governs overall control of the frequency management device 110 or the communication device 102. The memory 402 includes, for example, a main memory and an auxiliary memory. The main memory is, for example, a RAM. The main memory is used as a work area for the CPU 401.

  The auxiliary memory is, for example, a nonvolatile memory such as a magnetic disk, an optical disk, or a flash memory. Various programs for operating the frequency management device 110 are stored in the auxiliary memory. The program stored in the auxiliary memory is loaded into the main memory and executed by the CPU 401.

  The user interface 403 includes, for example, an input device that receives an operation input from the user, an output device that outputs information to the user, and the like. The input device can be realized by, for example, a touch panel, a key (for example, a keyboard), a remote controller, or the like. The output device can be realized by, for example, a touch panel, a display, a speaker, or the like. The user interface 403 is controlled by the CPU 401.

  The communication interface 404 is an interface that communicates with an external device of the frequency management device 110 by, for example, wireless or wired. The communication interface 404 is controlled by the CPU 401.

  The reception unit 111, the extraction unit 112, the transmission unit 113, the acquisition unit 114, and the update unit 115 of the frequency management apparatus 110 described with reference to FIG. That is, the function of each unit is realized by the CPU 401 executing various programs.

(Example of detailed configuration of functional configuration of frequency management device)
FIG. 5 is an explanatory diagram illustrating an example of a detailed configuration of the functional configuration of the frequency management device. In FIG. 5, the frequency management device 110 includes a reception unit 501, a reception signal processing unit 502, a frequency management unit 503, a transmission signal processing unit 504, a transmission unit 505, and a storage unit 520.

  The receiving unit 501 receives a signal indicating information related to a wireless method from the wireless device 101. The received signal processing unit 502 decodes the signal received by the receiving unit 501. For example, the received signal processing unit 502 decodes the signal to obtain the identification number of the wireless device 101, position information, wireless method information, and the like.

  The frequency management unit 503 refers to the storage unit 520 that stores the frequency usage for each area, and extracts a list of frequencies that can use the wireless method of the wireless device 101 in the area where the wireless device 101 is located. The transmission signal processing unit 504 packetizes a list of frequencies, destinations, and the like designated by the frequency management unit 503. The transmission unit 505 transmits the signal packetized by the transmission signal processing unit 504 to the wireless device 101.

  Here, the frequency management unit 503 includes a frequency list extraction unit 511, a frequency list determination unit 512, a usage status totaling unit 513, a congestion evaluation unit 514, and a radio system change unit 515. The frequency list extraction unit 511 extracts a frequency list for each area where the wireless device 101 is located with reference to the usage rule table 800 (see FIG. 8) stored in the storage unit 520. The frequency list determination unit 512 determines a list of available frequencies from the list of frequencies extracted by the frequency list extraction unit 511. The frequency list determination unit 512 outputs a list of available frequencies to the transmission signal processing unit 504.

  In addition, the reception unit 501 receives a signal indicating a frequency to be used from the wireless device 101 by transmitting a list of available frequencies to the wireless device 101. The usage status totaling unit 513 totals the frequencies used by the wireless device 101 and causes the storage unit 520 to store the totalization results. For example, the usage status totaling unit 513 updates the usage status database 900 (see FIG. 9) and the occupancy degree table 1000 (see FIG. 10) stored in the storage unit 520.

  The congestion evaluation unit 514 evaluates the degree of congestion of each frequency using the usage status totaling results updated by the usage status totaling unit 513. When a large number of wireless systems are mixed and radio waves are congested, radio wave interference is likely to occur. Therefore, the degree of congestion can be said to be the degree of interference. Specifically, the congestion evaluation unit 514 evaluates whether or not the degree of congestion is such that the signal deterioration due to interference becomes a predetermined value or more.

  The radio system changing unit 515 allows an available radio system in the area. For example, when the congestion evaluation unit 514 evaluates that the signal degradation due to the interference is a degree of congestion that exceeds a predetermined value, the wireless method changing unit 515 limits the available wireless methods. That is, the wireless method changing unit 515 limits the available wireless methods when the degree of congestion increases.

  In addition, after limiting available radio systems, the radio system changing unit 515 cancels the limitation of radio systems when the congestion evaluation unit 514 evaluates that the degree of congestion is almost free from signal degradation due to interference. That is, the wireless method changing unit 515 cancels the restriction on the available wireless methods when the degree of congestion becomes low.

  A reception unit 501, a reception signal processing unit 502, a frequency management unit 503, a transmission signal processing unit 504, a transmission unit 505, a frequency list extraction unit 511, a frequency list determination unit 512, and a usage status totaling unit 513 The congestion evaluation unit 514 and the wireless system change unit 515 are realized by the CPU 401 shown in FIG. That is, the functions of the units 501 to 505 and 511 to 515 are realized by the CPU 401 executing various programs. The storage unit 520 is realized by the memory 402 illustrated in FIG.

(An example of pixels in each area)
FIG. 6 is an explanatory diagram illustrating an example of pixels in each area. As illustrated in an explanatory diagram 600 of FIG. 6, the frequency management device 110 manages the frequency in units of pixels in which areas for each area are divided into grids, for example. Specifically, the number is assigned to each pixel, such as pixel 1, pixel 2,..., And the frequency is managed for each area including a plurality of pixels.

(An example of an available database for each pixel)
FIG. 7 is an explanatory diagram showing an example of an available database for each pixel. As shown in FIG. 7, in the available database 700, for example, available frequency bands are associated with the pixels of each area. In the frequency band, an upper limit frequency and a lower limit frequency are defined. In each pixel of the available database 700, “0” indicates an available frequency, and “1” indicates an unusable frequency. For example, in the pixel 1, the frequency band f1 can be used, and the frequency band f2 cannot be used. Thus, it is stored which frequency is available for each pixel in each area.

  When the maximum transmission power varies depending on the pixel, the maximum transmission power value may be stored in each database. In this case, for example, 0 W may be stored for frequencies that cannot be used. Further, when the maximum transmission power differs between the fixed device (fixed master wireless device) and the portable device (portable master wireless device), an available database 700 may be prepared for each device type. The available database 700 is stored in the storage unit 520 (see FIG. 5) of the frequency management device 110.

(Example of usage rule table)
FIG. 8 is an explanatory diagram showing an example of the usage rule table. As shown in FIG. 8, the usage rule table 800 shows the frequencies of the wireless systems that can be used in each area. For example, in area 1, the frequency f1 indicates that the wireless method a and the wireless method b can be used. The frequency f2 indicates that the wireless method a, the wireless method b, and the wireless method c can be used. Further, the frequency f3 indicates that the wireless system b and the wireless system c can be used.

  In other words, in the case of the wireless system a, the frequencies f1 and f2 can be used. In the case of the wireless system b, the frequencies f1, f2, and f3 can be used. In the case of the wireless system c, the frequencies f2 and f3 can be used. As described above, the usage rule table 800 indicates the frequencies that can be used for each wireless method in each area. The usage rule table 800 is stored in the storage unit 520 (see FIG. 5) of the frequency management device 110.

(Example of usage database)
FIG. 9 is an explanatory diagram illustrating an example of a usage status database. As shown in FIG. 9, the usage status database 900 stores a wireless system in use for each frequency for each pixel in each area. For example, the pixel 1 in the area 1 indicates that the wireless system a having the frequency f1 is being used. In addition, the pixel 3 in the area 1 indicates that the wireless system b having the frequency f2 is being used. In addition, the pixel k + 3 in the area 1 indicates that the wireless system c having the frequency f2 is being used.

(Example of occupancy degree table)
FIG. 10 is an explanatory diagram showing an example of the occupation degree table. As illustrated in FIG. 10, the occupation degree table 1000 stores an occupation degree for each radio system for each frequency in each area. The degree of occupation of the radio system x at the frequency fn can be calculated by the following equation (1).

  If the wireless device j uses the wireless system x, pn (x, j) = 1, otherwise 0. That is, the occupation can be calculated by counting the number of wireless devices using the wireless system x in the area.

  For example, as shown in the occupation degree table 1000, for the frequency f1, the wireless method a is P1 (a), the wireless method b is P1 (b), and the wireless method c is P1 (c). In the occupancy degree table 1000, the case where both the frequency and the radio system are three types has been described as an example, but this is only an example, and the frequency and the radio system can take many types.

(Example of sequence related to frequency use request)
FIG. 11 is an explanatory diagram showing an example of a sequence related to a frequency use request when there is one radio system in the frequency management system. As illustrated in FIG. 11, the wireless device 101 transmits information on the position and the wireless method to the frequency management device 110 (step S1101). When the frequency management apparatus 110 receives the information on the position and the radio system from the radio apparatus 101, the frequency management apparatus 110 transmits information indicating a list of available frequencies to the radio apparatus 101 (step S1102). The wireless device 101 selects a frequency to be used from the list of available frequencies and transmits information indicating the frequency to be used to the frequency management device 110 (step S1103).

  In this way, in the frequency management system 100, the frequency used in the wireless communication network 201 between the wireless device 101 and the communication device 102 is determined. When the frequency management apparatus 110 receives information indicating the frequency to be used from the wireless apparatus 101, the frequency management apparatus 110 updates the usage status database 900 (see FIG. 9) and the occupancy degree table 1000 (see FIG. 10).

  FIG. 12 is an explanatory diagram showing an example of a sequence related to a frequency use request when there are two radio systems in the frequency management system. As illustrated in FIG. 12, the wireless device 101 transmits information on the position and the wireless methods 1 and 2 to the frequency management device 110 (step S1201). When the frequency management apparatus 110 receives information on the position and the radio systems 1 and 2 from the radio apparatus 101, the frequency management apparatus 110 transmits information indicating a list of frequencies for the available radio systems 1 and 2 to the radio apparatus 101 (step S1202). .

  The wireless device 101 selects information on frequencies to be used for each of the wireless methods 1 and 2 from the list of frequencies for the available wireless methods 1 and 2 and displays information indicating the frequency and the wireless method to be used as a frequency management device. 110 (step S1203). In this way, in the frequency management system 100, the frequency and the wireless method used in the wireless communication network 201 between the wireless device 101 and the communication device 102 are determined. In FIG. 11, the case where there are two radio systems in the frequency management system has been described. However, when the number of radio systems in the frequency management system is n, the frequency is determined for each of the n radio systems. You can do it.

(An example of processing to unify the wireless system performed by the frequency management device)
FIG. 13 is a flowchart illustrating an example of a process for unifying the wireless system performed by the frequency management apparatus. As shown in FIG. 13, the frequency management device 110 determines whether or not the degree of congestion at the frequency fn is sufficiently large (step S1301). The timing for performing the determination in step S1301 is, for example, a timing for newly registering the wireless device 101 or every predetermined period.

  The degree of congestion at the frequency fn is sufficiently large when the sum of the occupation ratios of all the wireless systems is equal to or greater than a predetermined threshold, that is, when radio waves are congested due to a mixture of many wireless systems. is there. In addition, as a method of more accurately determining the degree of congestion, the communication area, transmission power, frequency usage time rate, and the like of each wireless device 101 may be used. For example, such information may be transmitted together with the frequency actually used by the wireless device 101 in the sequence of FIG. 10, and the frequency management device 110 may determine the degree of congestion using these information.

  For example, when transmitting information on the communication area together with the frequency actually used by the wireless device 101, the frequency management device 110 determines that pn (x, j) = communication if the wireless device j uses the wireless method x. If the area is not used, pn (x, j) = 0. The degree of congestion may be determined using the area of such an area, the sum of the occupation ratios of all wireless systems, and a predetermined threshold.

  When the degree of congestion is not sufficiently large (step S1301: No), the frequency management device 110 ends a series of processes according to this flow. When the degree of congestion is sufficiently large (step S1301: Yes), the frequency management device 110 extracts the radio system x ′ having the highest occupation level at the frequency fn (step S1302).

  Next, it is determined whether or not the radio system x 'having the highest degree of occupancy at the frequency fn satisfies the unified standard (step S1303). The unified standard will be described later with reference to FIG. When the wireless system x ′ does not satisfy the unified standard (step S1303: No), the series of processes according to this flowchart is terminated. When the radio system x ′ satisfies the unified standard (step S1303: Yes), it is determined that only x ′ is permitted as the radio system when using the frequency fn in the corresponding area (step S1304). Next, the frequency management apparatus 110 updates various tables such as a usage rule table 800 (see FIG. 8), a usage status database 900 (see FIG. 9), an occupancy degree table 1000 (see FIG. 10), and the like (step S1305). A series of processing by this flowchart is complete | finished.

  The unified standard of the radio system permitted in each frequency can be arbitrarily set by the administrator of the frequency management device 110. Here, the unification of the wireless system can be an index that reduces the restriction on the frequency use of each wireless device 101 as much as possible while improving the use efficiency of the entire frequency. The unified standard will be described below with reference to FIG.

  FIG. 14 is an explanatory diagram showing an example of a timing chart (No. 1) when periodically determining the degree of congestion for the frequencies f1, f2, and f3. In FIG. 14, a timing chart 1400 shows timing t1 when determining the degree of congestion for the frequency f1, timing t2 when determining the degree of congestion for the frequency f2, and timing t3 when determining the degree of congestion for the frequency f3. ing. Thus, the degree of congestion is periodically determined for each of the frequencies f1, f2, and f3.

  FIG. 15 is an explanatory diagram showing an example of the occupation degree table at the timing t1. For the frequency f1, the wireless system a having the highest occupation is a candidate for unification. Here, the occupation ratio Y is calculated using equation (2).

Substituting each value of the occupation degree table 1500 shown in FIG.
Occupancy ratio Y = (40 + 40 + 20) / (40 + 40 + 20 + 30 + 15 + 45 + 5 + 10 + 10) = 100/215
It becomes.

In addition, the expected ratio Z of the frequency dedicated to the wireless system a is
Expected ratio Z = [(sum of bandwidths of frequencies already limited to wireless system a + bandwidth of frequencies currently being determined) / number of types of total frequency widths] = (0 + 1) / (1 + 1 + 1) = 1/3
It can be expressed as.

  In the present embodiment, “occupation ratio Y ≧ expected ratio Z” is a unified standard. In the case of each value of the occupation degree table 1500, the unified standard is satisfied. Therefore, at the timing t1, the frequency f1 is unified to the wireless system a having the highest occupation. In addition, at the frequency f1, the wireless systems b and c cannot be used. As described above, when the radio wave is congested and the use is restricted to only the wireless method a, the frequency management device 110 notifies the wireless device 101 to that effect.

  FIG. 16 is an explanatory diagram showing an example of the occupation degree table at the timing t2. In the occupation degree table 1600 shown in FIG. 16, the frequency f1 is unified with the wireless system a because the frequency f1 satisfies the unified standard at the timing t1. The frequency f1 is unified with the wireless system a, and the wireless system b 30 with the frequency f1 in FIG. 15 moves by 15 to the frequencies f2 and f3 of the wireless system b shown in FIG. Further, the wireless system c 5 of the frequency f1 in FIG. 15 has moved to the frequency f2 of the wireless system c shown in FIG. That is, since the frequency f1 is unified with the radio system a, the radio apparatus b of the frequency system f1 and the radio apparatus 101 of the radio system c are changed to other frequencies.

  In the occupation degree table 1600, for the frequency f2, the wireless method a having the highest occupation degree is a unified candidate. Here, when the occupation ratio Y is calculated using each value of the occupation degree table 1600 and the expression (2), the occupation ratio Y becomes the occupation ratio Y = (40 + 40 + 20) / (40 + 40 + 20 + 30 + 60 + 15 + 10) = 100/215.

  The expected ratio Z is [(the sum of the bandwidths of frequencies already limited to the wireless system a + the bandwidth of the frequency currently being determined) / the number of types of the total frequency widths] = (1 + 1) / (1 + 1 + 1) = 2/3. That is, for the frequency f2 at the timing t2, “occupation ratio Y <expected ratio Z” is satisfied, and the unified standard “occupation ratio Y ≧ expected ratio Z” is not satisfied. Therefore, at timing t2, the frequency f2 is not unified with the wireless system a.

  FIG. 17 is an explanatory diagram illustrating an example of the occupation degree table at the timing t3. In the occupation degree table 1700 shown in FIG. 17, the frequency f1 is unified with the wireless system a because the frequency f1 satisfies the unified standard at the timing t1. In addition, since the frequency f2 does not satisfy the uniform standard at the timing t2, the radio system of the frequency f2 is not unified. Therefore, the occupation degree table 1700 shows the same value as the occupation degree table 1600 (see FIG. 16).

  In the occupancy degree table 1700, the radio system b with the highest occupancy degree is a unified candidate for the frequency f3. Here, when the occupation ratio Y is calculated using each value of the occupation degree table 1700 and the expression (2), the occupation ratio Y becomes the occupation ratio Y = (0 + 30 + 60) / (40 + 40 + 20 + 30 + 60 + 15 + 10) = 90/215.

  The expected ratio Z is [(the sum of the bandwidths of the frequencies already limited to the wireless system b + the bandwidth of the frequency currently being determined) / the number of types of the total frequency widths] = (0 + 1) / (1 + 1 + 1) = 1/3. That is, for the frequency f3 at the timing t3, “occupation ratio Y ≧ expected ratio Z” is satisfied, and the unified standard is satisfied. Therefore, the frequency f3 is unified with the wireless system b having the highest degree of occupation. Further, at the frequency f3, the wireless systems a and c cannot be used. As described above, when the radio wave is congested and the use is limited only to the wireless method b, the frequency management device 110 notifies the wireless device 101 to that effect.

(An example of processing to cancel the unification of the wireless system performed by the frequency management device)
FIG. 18 is a flowchart illustrating an example of a process for canceling the unification of the wireless system performed by the frequency management apparatus. As illustrated in FIG. 18, the frequency management device 110 determines whether or not the radio scheme x ′ having the highest degree of occupancy at the frequency fn satisfies the release criterion (step S1801). The determination in step S1801 is performed when newly registering the wireless device 101 or at predetermined intervals. The cancellation criterion will be described later with reference to FIG.

  When the radio system x ′ does not satisfy the release criterion (step S1801: No), a series of processes according to this flowchart is ended. If the radio system x 'satisfies the cancellation criteria (step S1801: Yes), the unification to the radio system x' when using the frequency fn in the corresponding area is canceled (step S1802). Next, the frequency management apparatus 110 updates various tables such as the usage rule table 800 (see FIG. 8) (step S1803), and ends a series of processes according to this flowchart.

  Note that an administrator of the frequency management apparatus 110 can arbitrarily set a cancellation reference for canceling the unification of the wireless system in each frequency. Here, the cancellation of the unification of the wireless systems can be an index that reduces the restriction on the frequency usage of each wireless device 101 as much as possible while improving the utilization efficiency of the entire frequency. The standard for canceling the unification of wireless systems will be described below with reference to FIG.

  FIG. 19 is an explanatory diagram of an example (part 2) of a timing chart for periodically determining the degree of congestion for the frequencies f1, f2, and f3. In FIG. 19, a timing chart 1900 shows the timing when performing radio system permission management on each frequency periodically in order. For example, at the timing t10, the frequency management device 110 determines the degree of congestion for the frequency f3.

  FIG. 20 is an explanatory diagram showing an example of the occupation degree table at the timing t10. As shown in the occupancy degree table 2000 in FIG. 20, it is assumed that the frequency f1 is unified with the wireless method a and the frequency f3 is unified with the wireless method b at the timing t10. Here, the cancellation of the radio system b of the frequency f3 will be described. First, the occupation ratio Y is calculated using equation (2).

Substituting each value of the occupancy degree table 2000 into equation (2),
Occupancy ratio Y = (15) / (40 + 30 + 15 + 25) = 15/110
It becomes.

Further, the dedicated frequency ratio W (equivalent to the expected ratio Z) of the wireless system b is
Dedicated frequency ratio W = (sum of frequency bandwidths limited to radio system b / number of types of total frequency widths) = (1) / (1 + 1 + 1) = 1/3
It can be expressed as.

  In the present embodiment, “occupation ratio Y <0.5 × dedicated frequency ratio W” is used as a release criterion. In the case of each value in the occupation degree table 2000 at the timing t10, the release criterion is satisfied. Therefore, at timing t10, the frequency f3 is no longer unified with the wireless system b. As described above, when the use is limited only to the wireless system b, when the radio wave becomes empty, the unification of the wireless system b at the frequency f3 is canceled and the wireless systems a and c can be used. Then, the frequency management device 110 notifies the wireless device 101 to that effect.

(Example of the sequence when the wireless system is changed)
FIG. 21 is an explanatory diagram showing an example of a sequence when the wireless method is changed. As illustrated in FIG. 21, the frequency management device 110 transmits information indicating a change in the list of available frequencies to the wireless device 101 when the wireless method is changed by satisfying the unified standard or canceling the unification of the wireless method. (Step S2101). The wireless device 101 selects a frequency to be used from the list of available frequencies and transmits information indicating the frequency to be used and the wireless method to the frequency management device 110 (step S2102).

  In this way, in the frequency management system 100, the frequency used in the wireless communication network 201 between the wireless device 101 and the communication device 102 is changed. When the frequency management device 110 receives information indicating the frequency to be used from the wireless device 101, the usage rule table 800 (see FIG. 8), the usage status database 900 (see FIG. 9), and the occupation, stored in the storage unit 520. The degree table 1000 (see FIG. 10) is updated.

(Modified example of sequence related to frequency use request)
FIG. 22 is an explanatory diagram showing a modified example of a sequence related to a frequency use request when there is one radio system in the frequency management system. The modification shown in FIG. 22 is different from the sequence related to the frequency use request shown in FIG. 11 in that the frequency management device 110 transmits information indicating the list of available frequencies and the valid period to the wireless device 101.

  As illustrated in FIG. 22, the wireless device 101 transmits information on the position and the wireless method to the frequency management device 110 (step S2201). When the frequency management apparatus 110 receives the information on the position and the radio system from the radio apparatus 101, the frequency management apparatus 110 transmits information indicating a list of available frequencies and the valid period to the radio apparatus 101 (step S2202). The wireless device 101 selects a frequency to be used from the list of available frequencies and transmits information indicating the frequency to be used to the frequency management device 110 (step S2203).

  In this way, in the frequency management system 100, the frequency to be used is determined until the valid period elapses in the wireless communication network 201 between the wireless device 101 and the communication device 102. When receiving the information indicating the frequency to be used from the wireless device 101, the frequency management device 110 updates the usage status database 900 (see FIG. 9) and the occupancy degree table 1000 (see FIG. 10) stored in the storage unit 520. . Further, when the valid period elapses, for example, the connection with the wireless device 101 is once released, and the operation of the sequence shown in FIG. 22 is performed again to enable reconnection.

  FIG. 23 is an explanatory diagram showing a modified example of a sequence related to a frequency use request when there are two radio systems in the frequency management system. 23 is different from the frequency shown in FIG. 12 in that the frequency management device 110 transmits to the wireless device 101 information indicating a list of frequencies for each of the available wireless systems 1 and 2 and the valid period. It is different from the sequence related to usage requests.

  As illustrated in FIG. 23, the wireless apparatus 101 transmits information on the position and the wireless systems 1 and 2 to the frequency management apparatus 110 (step S2301). When the frequency management apparatus 110 receives information on the position and the wireless systems 1 and 2 from the wireless apparatus 101, the frequency management apparatus 110 transmits to the wireless apparatus 101 a list of frequencies for each of the available wireless systems 1 and 2 and information indicating the validity period ( Step S2302).

  The wireless device 101 selects information on frequencies to be used for each of the wireless methods 1 and 2 from the list of frequencies for the available wireless methods 1 and 2 and displays information indicating the frequency and the wireless method to be used as a frequency management device. 110 (step S2303). In this way, in the frequency management system 100, the frequency and the radio system to be used are determined until the effective period elapses in the radio communication network 201 between the radio apparatus 101 and the communication apparatus 102. In FIG. 11, the case where there are two radio systems in the frequency management system has been described. However, when the number of radio systems in the frequency management system is n, the frequency is determined for each of the n radio systems. You can do it.

  When the frequency management device 110 receives information indicating the frequency to be used from the wireless device 101, the frequency management device 110 stores the usage status database 900 (see FIG. 9) and the occupancy degree table 1000 (see FIG. 10) stored in the storage unit 520. Update. Further, when the valid period elapses, for example, the connection is once released, and the operation of the sequence shown in FIG. 23 is performed again to enable the reconnection.

  By setting the effective period in this way, the available wireless devices 101 can be limited for each effective period, and long-term use by a specific wireless device 101 can be suppressed. Thereby, radio wave congestion can be suppressed. Even in the case where such an effective period is set, when radio waves are congested, it is possible to unify one radio system for each frequency.

  Moreover, when setting a valid period, the timing at the time of performing the permission management of a radio | wireless system is not restricted to every predetermined period (refer FIG. 14 and FIG. 19). By using the effective period set for each wireless device 101, it is possible to predict the congestion situation, and it is possible to predict that the cancellation standard for canceling the unification of wireless methods can be predicted. The timing may be a timing that satisfies the predicted release criterion.

(Example of throughput characteristics of wireless system x)
FIG. 24 is an explanatory diagram illustrating an example of throughput characteristics of the radio system x. Note that FIG. 24 illustrates a case where throughput degradation is used to determine the degree of congestion. In the graph of FIG. 24, the horizontal axis indicates the degree of congestion of wireless devices in the area, and the vertical axis indicates the throughput (communication speed). The frequency management apparatus 110 stores in advance, for each wireless method, the characteristics 2401 in the case of no mixing calculated by simulation or the like. A characteristic 2401 indicates a throughput characteristic when only the wireless device 101 of the wireless system x exists.

  Each of the wireless devices 101 periodically reports (transmits) the throughput characteristics to the frequency management device 110. The frequency management device 110 calculates the deterioration in throughput of each wireless method based on the report result of the wireless device 101. Throughput degradation is a difference from the characteristic 2401. When radio systems coexist, the characteristic 2402 is derived, for example, by calculating throughput degradation. A characteristic 2402 indicates a throughput characteristic when the wireless apparatus 101 of the wireless system x has only p%.

  Using such throughput characteristics, it may be determined that the degree of congestion is large when the sum of throughput degradation (difference from characteristics 2401) is equal to or greater than a threshold value. In this way, it is also possible to determine the degree of congestion using the degradation of throughput.

  Further, for example, the wireless device 101 may directly measure the interference power of another wireless device 101 and report (transmit) the interference power for each wireless method to the frequency management device 110. In this case, the frequency management device 110 may total the report values from the wireless device 101, and may determine that the degree of congestion is large when the interference power between different wireless methods is equal to or greater than a threshold value.

  As described above, in the embodiment, by setting a usable frequency according to the combination of the position of the wireless device 101 and the wireless method, occurrence of each communication that is difficult to control interference with the same frequency and different wireless methods. Can be reduced and interference can be reduced. Further, for example, since it is not necessary to perform a test in advance to identify the frequency and confirm whether the secondary frequency can be used, it is possible to prevent the man-hours for maintenance of the frequency management.

  Further, in this embodiment, since the frequency that can use the wireless method of the wireless device 101 is extracted based on the information related to the wireless method received from the wireless device 101, radio wave interference between the wireless devices 101 of different wireless methods is detected. Can be suppressed.

  Further, in the present embodiment, the radio system corresponding to the frequency at which the radio wave interference degree for each frequency exceeds a predetermined degree is reduced, so that radio wave interference at a congested frequency can be reduced.

  Further, in this embodiment, when the degree of interference falls below a predetermined degree, the radio scheme reduced corresponding to the frequency at which the degree of interference exceeds the predetermined degree is restored. Therefore, when congestion is alleviated and interference is reduced, the restriction of the wireless system can be eliminated and a usable wireless system can be freely used.

  Further, in the present embodiment, the wireless method selected based on the number of wireless terminals that are using the wireless method from the wireless methods corresponding to the frequencies whose interference degree exceeds a predetermined degree is disabled. Therefore, it is possible to disable a radio system with a small number of uses. The wireless device 101 of the wireless method that has become unusable can be used in the same wireless method, for example, by changing to another frequency, so that the number of wireless devices 101 to be changed to another frequency can be suppressed. , The load at the time of change can be reduced.

  Also, in this embodiment, the radio scheme is not reduced when there is no radio scheme whose occupation ratio exceeds the threshold among the radio schemes corresponding to the frequencies whose interference degree exceeds a predetermined degree. Thereby, it is possible to prevent the frequency from being changed when there are a large number of wireless devices 101 that need to change the frequency. Therefore, it is possible to prevent a load related to the change to another frequency of the wireless device 101.

  In the present embodiment, since the wireless system is unified when the standard of “occupation ratio Y ≧ expected ratio Z” is satisfied, the same wireless system is set to be biased to one frequency. Can be suppressed. Therefore, the radio system can be made different for each frequency, and radio wave interference can be reduced.

  Further, in the present embodiment, use of the wireless method of the wireless device 101 is permitted until an effective period in which the frequency can be used elapses. As a result, the available wireless devices 101 can be limited for each effective period, and long-term use by a specific wireless device 101 can be suppressed. Therefore, radio wave interference can be reduced.

  The following additional notes are disclosed with respect to the embodiment described above.

(Supplementary note 1) The wireless device transmits information indicating a wireless method that the wireless device can use for wireless communication or wireless broadcasting to the control device,
The control device extracts a frequency corresponding to a wireless method indicated by information transmitted by the wireless device from frequency information associating a wireless method with a usable frequency, and transmits information indicating the extracted frequency to the wireless device To the device,
The wireless device performs wireless communication or wireless broadcasting at a frequency indicated by information transmitted by the control device;
A communication method characterized by the above.

(Appendix 2) The control device is
Based on information indicating the radio wave interference level for each frequency in the radio device group including the radio device, the frequency information is updated so as to reduce the radio system corresponding to the frequency at which the interference level exceeds a predetermined level,
Extracting the frequency corresponding to the wireless method indicated by the information transmitted by the wireless device from the updated frequency information, and transmitting the information indicating the extracted frequency to the wireless device.
The communication method according to supplementary note 1, wherein:

(Additional remark 3) If the said control apparatus is less than the said predetermined degree when the said interference degree of the frequency where the said interference degree exceeded the said predetermined degree based on the information which shows the said interference degree, the said interference degree will be the said predetermined degree Updating the frequency information to restore the reduced radio scheme corresponding to frequencies exceeding the degree of
Extracting the frequency corresponding to the wireless method indicated by the information transmitted by the wireless device from the updated frequency information, and transmitting the information indicating the extracted frequency to the wireless device.
The communication method according to Supplementary Note 2, wherein

(Additional remark 4) Based on the number of the radio | wireless terminals which the said control apparatus is using the said radio | wireless system among the radio | wireless systems corresponding to the frequency in which the said interference degree exceeds the said predetermined | prescribed degree. Updating the frequency information to disable the selected wireless method;
The communication method according to appendix 2 or 3, characterized in that:

(Additional remark 5) The ratio of the number of the radio | wireless terminals which are using the said radio | wireless system with respect to the number of the said radio | wireless apparatus groups among the radio | wireless systems which the said control apparatus respond | corresponds to the frequency in which the said interference degree exceeds the said predetermined degree. The communication method according to any one of appendices 2 to 4, wherein when there is no radio system exceeding the threshold, the radio system corresponding to a frequency with which the degree of interference exceeds the predetermined degree is not reduced.

(Appendix 6) The control device is
Updating the frequency information so as to enable only one radio scheme among radio schemes corresponding to frequencies where the degree of interference exceeds a predetermined degree;
The communication method according to appendix 5, wherein the threshold value is a threshold value according to the number of frequencies in which only the wireless method can be used in the frequency information.

(Supplementary note 7) The control device transmits information indicating the extracted frequency and information indicating a period in which the extracted frequency is usable to the wireless device,
The wireless device performs wireless communication or wireless broadcasting at a frequency indicated by the information transmitted by the control device until the period indicated by the information transmitted by the control device has elapsed.
The communication method according to any one of supplementary notes 1 to 6, characterized in that:

(Appendix 8) A wireless device that transmits information indicating a wireless method that the device itself can use for wireless communication or wireless broadcasting;
Control for extracting a frequency corresponding to a wireless method indicated by information transmitted by the wireless device from frequency information associating a wireless method with a usable frequency, and transmitting information indicating the extracted frequency to the wireless device Equipment,
Including
The wireless device performs wireless communication or wireless broadcasting at a frequency indicated by information transmitted by the control device.

(Additional remark 9) The receiving part which receives the information which shows the radio system which a radio | wireless apparatus can use for radio | wireless communication or radio | wireless broadcasting from the said radio | wireless apparatus,
An extraction unit for extracting a frequency corresponding to the wireless method indicated by the information received by the receiving unit from the frequency information associating the wireless method with a usable frequency;
A transmission unit that transmits information indicating the frequency extracted by the extraction unit to the wireless device;
A control device comprising:

(Additional remark 10) The transmission part which transmits the information which shows the radio | wireless system which an own apparatus can use for radio | wireless communication or radio broadcasting to a control apparatus,
Reception that receives information indicating the frequency corresponding to the wireless method indicated by the information transmitted by the transmission unit, extracted from the frequency information that associates the wireless method and the usable frequency, from the control device. And
A wireless unit that performs wireless communication or wireless broadcasting at a frequency indicated by the information received by the receiving unit;
A wireless device comprising:

DESCRIPTION OF SYMBOLS 100 Frequency management system 101 Radio | wireless apparatus 102 Communication apparatus 110 Frequency management apparatus 111 Reception part 112 Extraction part 113 Transmission part 114 Acquisition part 115 Update part 201 Wireless communication network 220 Network 301 CPU
302 Memory 303 User Interface 304 Communication Interface 305 Position Information Acquisition Device 401 CPU
402 Memory 403 User Interface 404 Communication Interface 501 Reception Unit 502 Reception Signal Processing Unit 503 Frequency Management Unit 504 Transmission Signal Processing Unit 505 Transmission Unit 511 Frequency List Extraction Unit 512 Frequency List Determination Unit 513 Usage Status Totalization Unit 514 Congestion Evaluation Unit 515 Wireless System Change unit 520 storage unit

Claims (7)

A wireless device transmits information indicating a wireless method that the wireless device can use for wireless communication or wireless broadcasting to a control device;
Based on information indicating the radio wave interference level for each frequency in the radio device group including the radio device , the control device sets frequency information associating a radio system with a usable frequency, and the interference level is set to a predetermined level. The wireless system corresponding to the frequency exceeding the frequency is updated to be reduced, and the frequency corresponding to the wireless system indicated by the information transmitted by the wireless device is extracted from the updated frequency information , and the information indicating the extracted frequency is To the wireless device,
The wireless device performs wireless communication or wireless broadcasting at a frequency indicated by information transmitted by the control device;
A communication method characterized by the above. The wireless method selected by the control device based on the number of wireless devices that are using the wireless method in the wireless device group from wireless methods corresponding to frequencies at which the degree of interference exceeds the predetermined degree. Update the frequency information to disable
The communication method according to claim 1. Of the radio systems corresponding to the frequency at which the degree of interference exceeds the predetermined degree, the control apparatus is a radio in which the ratio of the number of radio apparatuses using the radio system to the number of radio apparatus groups exceeds a threshold. 3. The communication method according to claim 1, wherein when there is no system, a wireless system corresponding to a frequency at which the degree of interference exceeds the predetermined degree is not reduced. The control device transmits information indicating the extracted frequency and information indicating a period in which the extracted frequency is usable to the wireless device,
The wireless device performs wireless communication or wireless broadcasting at a frequency indicated by the information transmitted by the control device until the period indicated by the information transmitted by the control device has elapsed.
The communication method according to any one of claims 1 to 3. A wireless device that transmits information indicating a wireless method that the device can use for wireless communication or wireless broadcasting;
Based on the information indicating the radio wave interference level for each frequency in the radio device group including the radio device, the frequency information associating the radio system with the usable frequency corresponds to the frequency at which the interference level exceeds a predetermined level. Update to reduce the radio system, extract the frequency corresponding to the radio system indicated by the information transmitted by the radio device from the updated frequency information, and transmit the information indicating the extracted frequency to the radio device A control device;
Including
The wireless device performs wireless communication or wireless broadcasting at a frequency indicated by information transmitted by the control device. A receiver that receives information indicating a wireless method that the wireless device can use for wireless communication or wireless broadcasting from the wireless device;
Based on the information indicating the radio wave interference level for each frequency in the radio device group including the radio device, the frequency information associating the radio system with the usable frequency corresponds to the frequency at which the interference level exceeds a predetermined level. An update unit that updates to reduce the radio system, and extracts a frequency corresponding to the radio system indicated by the information received by the reception unit from the updated frequency information;
A transmission unit that transmits information indicating the frequency extracted by the extraction unit to the wireless device;
A control device comprising: Based on the information indicating the radio wave interference degree for each frequency in the radio apparatus group including the self radio apparatus, the frequency information associating the radio system with the usable frequency corresponds to the frequency at which the interference degree exceeds a predetermined degree. A transmission unit that transmits information indicating a wireless method that the wireless device can use for wireless communication or wireless broadcasting to a control device that is updated to reduce the wireless method;
A receiving unit that receives information indicating a frequency corresponding to a radio scheme indicated by the information transmitted by the transmitting unit, extracted from the frequency information updated by the control unit, from the control unit;
A wireless unit that performs wireless communication or wireless broadcasting at a frequency indicated by the information received by the receiving unit;
A wireless device comprising:

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